On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 20
... reasons make me believe in this ; but the chief one is the remarkable effect which confinement or cultivation has on the function of the reproductive system : ( this system appearing to be far more susceptible than any other part of the ...
... reasons make me believe in this ; but the chief one is the remarkable effect which confinement or cultivation has on the function of the reproductive system : ( this system appearing to be far more susceptible than any other part of the ...
Page 24
... reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to be of the highest importance in ...
... reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to be of the highest importance in ...
Page 28
... reasons which I cannot here give , I am with much doubt inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from his large and varied stores of ...
... reasons which I cannot here give , I am with much doubt inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from his large and varied stores of ...
Page 32
... reasons which have led me to this belief are in some degree applicable in other cases , I will here briefly give them . If the several breeds are not varieties , and have not proceeded from the rock - pigeon , they must have descended ...
... reasons which have led me to this belief are in some degree applicable in other cases , I will here briefly give them . If the several breeds are not varieties , and have not proceeded from the rock - pigeon , they must have descended ...
Page 35
... reasons , namely , the improbability of man having formerly got seven or eight supposed species of pigeons to breed freely under domestication ; these supposed species being quite unknown in a wild state , and their becoming nowhere ...
... reasons , namely , the improbability of man having formerly got seven or eight supposed species of pigeons to breed freely under domestication ; these supposed species being quite unknown in a wild state , and their becoming nowhere ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely